from los angeles, i am tavis smiley. tonight, a conversation with joan walsh. she has a new book, "what's the matter w/white people?: why we long for a golden age that never was," and also tonight, technology correspondent david pogue. starting this week, he takes over as host of "nova sciencenow" here on pbs. that is coming up right now. >> there is a saying that dr. king had that said there is always the right time to do the right thing. i just try to live my life every day by doing the right thing. we know that we are only halfway to completely eliminate hunger, and we have work to do. walmart committed $2 billion to fighting hunger in the u.s. as we work together, we can stamp hunger out. >> and by contributions to your pbs station from viewers like you. thank you. tavis: joan walsh is an editor at large for salon and the author of a new book, "what's the matter w/white people?: why we long for a golden age that never was." she joins us tonight from new york. >> thank you, tavis. good to be back. tavis: this title is provocative. "what's the matter with whi